The goal for this project was to build it with mostly parts that I had in my lab instead of designing or buying something special so for this reason some hacking had to be done.

Thanks to the MSP430 used inside, In this video I calculate the MS6612 light meter should get up to 470 hours of continuous usage.

Another VoltLog InTheMail, this time I receive the following items:

  • ICR18650-26F 2600mAh 3.6V Rechargeable Li-ion Battery
  • NCR18650B 3400mAh 3.7V Rechargeable Li-ion Battery
  • 3S JST connector cable
  • DC-DC 0.9V-5V USB Output Charger Step Up Power Module
  • ESD Anti-Static Shielding ZIP LOCK Bags
  • Mifare RC522 RFID Induction Reader Module
  • 100 Pcs 0805 SMD LED Diode 5 Colors
  • Original Xiaomi 5000mAh Ultra-thin 9.9mm Power Bank
  • TI Precision Amplifier Quickstart Kit AMPQUICKKIT-EVM: OPA313, OPA314, OPA316, OPA170, OPA171, OPA172

Links for all of these are in the video description on YouTube.

In this video I am switching my HP 3478A from 120V 60Hz AC to 230V 50Hz AC using the internal selection. I am also comparing some voltage and resistance measurements to my Keithley 175 and I realize the HP needs calibration if I am to trust it’s measurements. While I was inside the meter I also checked the voltage of the internal battery used to store calibration data.

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